Tire-pressure gage



E. D WHITE.

TIRE PRESSURE GAGE,

APPLICATION FILED MAY19. 1919.

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EARL ll). WHITE, h JDZEIL'TA, COLORADU.

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Specification oi! Letters JPatent.

Patented duly a, read Application filed May 19, 1919'. serial No. 293,251.

To all whom it may concern:

Be it known that l, EARL l). WHITE, citizen of the United States of America, residing at Delta, in the county of Delta and State of Colorado, have invented certain new and useful Improvements in Tire-Pressure Gages, of which the following is a specification.

My invention relates to indicators primarily adapted for measuring the pressure in pneumatic tires.

The object of my invention is to provide a pressure indicator which will automatically register the pressure in a tire during the pumping or inflating operation.

With the above and other objects in view, my invention consists in the construction, combination and arrangement of parts, all as hereinatter more fully described, claimed and illustrated in the accompanying drawin s, wherein igure 1 is a view in elevation, partly broken away showing my invention applied;

Fig. 2 is a longitudinal sectional view of the invention showing the gage extended, and

Fig. 3 is a section on the line 3-3 0t eferring more particularly to the drawings wherein lilre reference numerals denote corresponding parts throu hout the several views, 5 is a hollow cylindrical bed of light sheet metal containing a pressure indicator 1A, to be described more fully hereinafter in connection with the operation of the device. The lower end 6 of the body 5 isprovided with a contracted inclined extension 7 and this extension is provided with an internally screw threaded thumb nut 8, revoluble thereon, by means of which the cylindrical body may be attached to the tire nipple 9. ln order that the valve 10 of the tire nipple J9 may be forced open and retained in open position when the thumb nut is screwed home, the extension 7 is provided with a pin 11. By inclining the extension 7 somewhat from the direction of the length of the member 5, the device, when attached to a tire nipple will be much more accessible.

The cylindrical member 5 is adapted to be connected either permanently or temporarily to the ordinary hand pump (not shown) by means of an externally threaded tubular member 12 extending at right angles from the member 5.

In use the thumb nut 8 is secured to the tire nipple and air forced through the tubular member 12 into and along the space 13 around the pressure indicator stem 14:, thence through the check valve 15 formed in the plunger head or piston 16 and out through the extension 7 into the tire nipple. As the pressure in the tire being "pumped rises, the pressure against the piston 16 causes the latter to rise against the tension of the coil spring 17. The end of the stem 14 opposite the piston 16, is provided with suitable graduations, 18 which can be readily read when the stem has been forced to protrude from the cylindrical body 5 by the pressure of air against the piston. A cap 1%) and packing 20 prevents escape of the air.

The graduations 18 on the stem are designed to indicate a danger pressure of say ninety pounds when the piston 16 is forced outwardly by the pressure in the tire, as

illustrated in Fig. 2.

Havin thus described my invention: Whatd claim is: g ln a device of the class described, a holldw cylindrical body having a 'contracted inclined till tubular extension, a spring pressed pressure indicator slidably mounted in said body, said indicator comprising a stem and piston, a check valve in said piston,-mean's for connecting said bod with a pump at a point above the norma downward limit of movement of said piston and means tor connectin the tubular extension'to a tire nipple.

n testimony whereof I adix my signature in presence of two witnesses rant. n. wnrrn Witnesses:

l l. Wnrrn, Jenn W. dnrrn. 

